Add conversion functions to Size and Vector

core/src/size.rs

@@ -1,3 +1,4 @@
+use super::vector::Vector;
 use std::f32;
 
 /// An amount of space in 2 dimensions.
@@ -57,6 +58,15 @@ impl From<[u16; 2]> for Size {
     }
 }
 
+impl From<Vector<f32>> for Size {
+    fn from(vector: Vector<f32>) -> Self {
+        Size {
+            width: vector.x,
+            height: vector.y,
+        }
+    }
+}
+
 impl From<Size> for [f32; 2] {
     fn from(size: Size) -> [f32; 2] {
         [size.width, size.height]